Start-Up (2020)

Bae Suzy
Seo Dal Mi
Main Role
Nam Joo Hyuk
Nam Do San
Main Role
Kim Seon Ho
Han Ji Pyung
Main Role
Kang Han Na
Won In Jae
Main Role

Kim Hae Sook
Choi Won Deok
Support Role
Kim Do Wan
Kim Yong San [Software engineer]
Support Role
Yoo Soo Bin
Lee Cheol San [Software engineer]
Support Role
Stephanie Lee
Jung Sa Ha [Sandbox]
Support Role
Kim Hee Jung
Park Geum Jung [Do San's mother / Seong Hwan's wife]
Support Role
Kim Won Hae
Nam Seong Hwan [Do San's father / Geum Jung's husband]
Support Role
Jang Se Hyun
Nam Cheon Ho [Do San's cousin]
Support Role
Song Sun Mi
Cha Ah Hyun [Dal Mi & In Jae's mother]
Support Role
Uhm Hyo Sub
Won Doo Jung [In Jae's Stepfather]
Support Role
Moon Dong Hyuk
Won Sang Soo [In Jae's stepbrother]
Support Role
Seo Yi Sook
Yoon Seon Hak [SH Venture Capital Director]
Support Role
Kim Min Seok
Park Dong Chun [SH Venture Capital employee]
Support Role
Jasper Cho
Alex Kwon [2STO]
Support Role
Kang Yoo Seok
Shin Hyun [Developer]
Support Role
Joo Bo Young
Shin Jung [Developer]
Support Role
Song Ho Soo
Lee Dae Myung [In Jae's employee]
Support Role
Lee Min Ryung
Yi Soo [In Jae's employee]
Support Role

Kim Jong Ho
[SH Venture Capital employee] (Ep. 1)
Guest Role
Park Choong Seon
[Manager of Il Cheung Constructon & Trading] (Ep. 1)
Guest Role
Park Young Soo
[Real estate agent] (Ep. 1)
Guest Role
Yoo Mi Ran
[Real estate agent] (Ep. 1)
Guest Role
Ahn Soo Bin
Lee Min Ji (Ep. 1)
Guest Role
Ji Sung Geun
[Bus passenger] (Ep. 1)
Guest Role
Nam Da Reum
Han Ji Pyung [Young] (Ep. 1-2)
Guest Role
Heo Jung Eun
Seo Dal Mi [Young] (Ep. 1, 3-4, 16)
Guest Role
Kim Joo Heon
Seo Chung Myung [Dal Mi and In Jae's father] (Ep. 1, 4, 16)
Guest Role
Kim Kang Hoon
Nam Do San [Young] (Ep. 1, 5, 9, 12)
Guest Role
Lee Re
Won In Jae [Young] (Ep. 1, 16)
Guest Role
Bae Bo Ram
[Barista, Lucca The Tea] (Ep. 2)
Guest Role
Kim Ji In
Seo Hyun [Lucca The Tea employee] (Ep. 2-3)
Guest Role
Jung Ji Hyun
[Barista, Lucca The Tea] (Ep. 2)
Guest Role
Choi Yun Seol
[Hotel waitress] (Ep. 2)
Guest Role
Yoon Seo Hyun
[HR manager, Lucca The Tea] (Ep. 2-3)
Guest Role
Jo Ah Ra
Assistant Manager Jung [Lucca The Tea / Sa Ha's sister] (Ep. 2-3, 13, 16)
Guest Role
Yu Seung Il
[Cheon Ho's father] (Ep. 3)
Guest Role
Hong Boo Hyang
[Cheon Ho's mother] (Ep. 3)
Guest Role
Kwon Ki Joo
[Deliveryman] (Ep. 3)
Guest Role
Ko Seong Jun
[In Jae's developer] (Ep. 4)
Guest Role
Go Han Min
Go Eun Hyun (Ep. 4)
Guest Role
Kwon Ban Suk
[Investor] (Ep. 4)
Guest Role
Kim Chae Hyun
[Hackathon CEO] (Ep. 5)
Guest Role
Jang Young Hyun
[Hackathon CEO] (Ep. 5)
Guest Role
Kim Sung Yong
[College math teacher] (Ep. 5)
Guest Role
Seol Chang Hee
[Cheol San's co-worker] (Ep. 6)
Guest Role
Moon Se Yoon
[Security guard] (Ep. 7)
Guest Role
Bae Hae Seon
Lee Hye Won [Seonju CEO] (Ep. 8)
Guest Role
Im Sung Mi
[Blind woman] (Ep. 8)
Guest Role
Gu Bon Jin
[Detective] (Ep. 8)
Guest Role
Park Chan Ho
Park Chan Ho (Ep. 8, 12)
Guest Role
Lee Dong Hee
Oh Yeon Ho (Ep. 9-10)
Guest Role
Yang Dae Hyuk
Reporter Choi Yang Won (Ep. 9-10)
Guest Role
Lee Da Hae
[Start-up CEO] (Ep. 10-11)
Guest Role
Lee Bo Young
[Woman at pub] (Ep. 10)
Guest Role
Oh Kyu Taek
[Park cleaning man] (Ep. 10)
Guest Role
Jung Wook Jin
Kim Dong Su (Ep. 11)
Guest Role
Jun Joon Woo
[2STO employee] (Ep. 11-12)
Guest Role
Kim Ji Su
[Flight attendant] (Ep. 12)
Guest Role
Jang Hae Song
[Insurance salesman] (Ep. 13)
Guest Role
Shin Dong Hoon
[Investor] (Ep. 14)
Guest Role
Jeon Yeo Jin
[Investor] (Ep. 14)
Guest Role
Lim Seung Beom
[Investor] (Ep. 14)
Guest Role
Yeo Jin Goo
Jang Yeong Shil [Voice] | Hong Ji Seok [CEO of Chan Seong Ltd.] (Ep. 16)
Guest Role
Kim Hyun Mok
[New tenant in the old Sam San Tech office]
Guest Role
Kim In Sun
[Cafe part-timer]
Guest Role
Oh Young Mi
[Student's mother] (Ep. 5, 9)
Guest Role
Hong Seong Gwan
[Startup guy] (Ep. 16)
Guest Role
Oh Ji Yeon
[Investor] (Ep. 4)
Guest Role
Jang Woo Jun
[Playground boy]
Guest Role
An Young Mi
[Waitress] (Ep. 10)
Guest Role
Jeong Si Hun
[Handsome man in neighborhood]
Guest Role
Kim Sung Yeol
[Photographer] (Ep. 14)
Guest Role
Park Sang Hyun
[Magazine staff] (Ep. 14)
Guest Role
Hong Eun Jeong
[Woman in the rain]
Guest Role
Kim Seong In Guest Role
Jung Joon
[Autograph student]
Guest Role
Jung Jun Hwan
[hackathon participant (ep.10-11)]
Guest Role
Lee Chang Won Guest Role
Park Seung Chan
[Doctor] (Ep.6)
Guest Role
Ahn Ji Hwan
Han Kang Jin
Guest Role
Bae Yoo Ri
[Hackathon CEO] (Ep. 5)
Guest Role
Joo Seung Min
[Investor] (Ep. 4)
Guest Role
Bret Allan Lindquist
[2STO employee] (Ep. 11-12)
Guest Role